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An actual refrigerator absorbs 500 kJ of heat from a sink at 250 K and reject 660 kJ of heat to environment at 300 K. T0 = 300 K. the heat transfer processes are reversible. Determine the actual COP of the device.
the pipe that supplies drinking water to a community in a cold region of the planet is buried a depth of 3m from the
a boiler is fed with a distillate fuel oil of composition c9h16o2n0.03. combustion occurs with 20 excess air. assume
a mixing chamber receives 3kgmin ammonia as saturated liquid at -20 c from one line and ammonia at 40 c 300 kpa from
a hydrogen tank 25 cm in diameter and 80 cm in height is charged to 150 atmospheres at room temperature 25 c. a
steam enters an extraction turbine in a vapor power plant operating at steady stte at 10 mpa 480 c. 25 of the steam is
nitrogen n2 gas within a piston-cylinder assembly undergoes a compression from p1 0.2mpa v12.75 m3 to a state where p2
consider the heating of an incompressible fluid with velocity um inside a thin - walled tube. the diameter of the tube
Assume that viscous effects are negligible Plot this data using appropriate dimensionless groups
part a.the slender bar ab rests on a smooth surface at b and is attached to a collar a that slides freely on the smooth
the 10 pounds weight is supported by the cord AC and roller and by a spring.if the spring has unstreched lenngth of 8 inches and the weight in equilibrium when d=a inches.determine the stiffness K of the spring?
the performance of a device is defined as the ratio of the desired output to the required input and this definition can
air enters a machine at 373 k with a speed of 200 msec and leaves it at the temperature of the standard sea level
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